Neither, one is junk, Fix-A-Flat, unreliable as to pressure loss or blowing up in your trunk on a hot day. Tire will not be hurt but you do need to tell the repair kid that it was used and it may have flammable gas in the tire and that now the tire has to be pulled down and the inside washed of the goo. Slime Kit all the way. 60 some odd bucks Prime Amazon.com and more than just a expolsive can in your trunk. I have one in each vehicle and a small one on the Indian and a midsize in the Boata. Just daily prepping in the real world and with the cost of tires above 2C then a good cost efficient way to stay on the road. So easy to use even a LIB can find a homeless person to use it for them. 5 Bucks$$$ and the LIB stays dirt free.